Sound and Sound Waves

An observer moves towards a source of sound at a speed of 30 ms-1

If the frequency of the sound to a stationary observer is 500 Hz the frequency to the moving observer is

• 456 Hz

• 544 Hz

• 460 Hz

• 548 Hz

Tags

NGSS.MS-PS4-1

Bending of waves around an object (such as through a doorway)

• sound

• diffract

• pitch

• volume

Tags

NGSS.MS-PS4-2

The number of wavelengths that pass a point each second

• frequency

• wavelength

• pitch

• amplitude

Material (matter) through which a wave travels

• medium

• Doppler Effect

• sound

• pitch

Tags

NGSS.MS-PS4-2

How high or low a sound is; depends on the frequency (greater frequency= higher pitch)

• pitch

• frequency

• sound

• medium

A disturbance that transfers energy from one place to another without transferring energy

• wave

• trough

• pitch

• sound

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

A reflected sound wave

• frequency

• pitch

• echo

• rarefaction

Tags

NGSS.MS-PS4-2

A wave that requires a medium through which to travel

• mechanical wave

• chemical wave

• electromagnetic wave

• pitch

Tags

NGSS.MS-PS4-2

Cletus wants to make ear protectors for people who work around loud jet engines at Hartsfield Airport in Atlanta. Which of the following materials should he experiment with for the best results?

• a material that produces sound

• a material that absorbs sound

• a material that transmits sound

• a material that amplifies sound

Tags

NGSS.MS-PS4-2

After the train passed, the pitch of the train whistle became lower. This change in sound would be represented by what change in the diagram above?

• The distance represented by C would increase.

• The distance represented by C would decrease.

• The distance represented by D would increase.

• The distance represented by D would decrease.

Tags

NGSS.MS-PS4-1